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Design and experimental research of magnetically excited rotating piezoelectric energy harvester

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Abstract

Piezoelectric energy harvesting is a widely used and environmentally friendly power generation technology, which can provide power for wireless electronic devices and low-power sensors. In this paper, a magnetically excited rotating piezoelectric energy harvester is proposed, which can generate output voltages of more than 15 V at frequencies below 13 Hz, where the maximum output voltage is 55.62 V. Through the rotation of the rotamer, magnetic coupling between magnetic blocks drives piezoelectric elements to vibrate nonlinearly to generate electrical energy. Structural prototypes with different parameters were designed and produced after analyzing the working principle and theoretical model of the entire piezoelectric system, and a series of experimental verifications were carried out on the theoretical model. The experimental results show that the energy harvester has the best power generation effect when the weight of the magnet mass is 6 g, the radial excitation distance is 5 mm, and multiple piezoelectric beams are connected in series. When the piezoelectric beams are connected in series and rotational speed is 550 r/min, the external load resistance is 75 kΩ, its maximum root mean square output voltage and average output power are 33.12 V and 14.625 mW, respectively. The energy harvesting system can light up 260 LED lights under the excitation of 550 r/min.

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Acknowledgements

This work was supported by the NSFC of China (No. 51805489), the National Study Abroad Fund of China ( No. 202008220173) and Project of Jilin Provincial Education Department: Research on River Hydrological Monitoring Device Based on ADCP Sensor under Grant jijiaokehezi [2014] no. 140.

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Correspondence to Lipeng He or Zhe Wang.

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He, L., Wang, Z., Yu, G. et al. Design and experimental research of magnetically excited rotating piezoelectric energy harvester. Microsyst Technol 28, 1593–1600 (2022). https://doi.org/10.1007/s00542-022-05279-8

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